I was early enough into DAB and close enough to test transmission sites to have heard DAB at 256 kb/sec. It was fine at 224 too and even 192 was tolerable for some material; but since 2001 it's been all down hill. I go months on end without switching it on and only then to assure myself that keeping it off is the right decision.My thinking too. If anything bit rates have dropped slightly more since DAB launched.
Sometimes I listen on Freeview or cable rather than on Dab.
I recently bought a Topfield PVR (Freeview) for the bedroom TV and find it excellent for radio, even with a portable aerial. If speakers are connected directly to the PVR, the TV can be left off at the mains for live radio, although the TV screen is required in order to access the list of recordings.